I'm not sure if this is what you mean but in some ways it would be nice to have tighter coupling with a registry. Docker build is kind of like a multiplexer - pull from here or there and build locally, then tag and push somewhere else. Most of the time all pulls are from public registries, push to a single private one and the local image is never used at all.

It seems overly orthogonal for the typical use case but perhaps just not enough of an annoyance for anyone to change it.